Regulator feeding control with two flow rate laws

Abstract

Hydromechanical regulator for controlling the flow of fuel injected into a turbomachine by means of a fuel feed unit ( 10 ), comprising a tachometric balance ( 20 ) having a beam consisting of two arms ( 24, 26 ), which beam can move about a pivot pin ( 22 ) under the action of at least a first force F 1 applied by a drive rod ( 18 ) of the fuel feed unit via a first elastic member ( 28 ), and a rod ( 36 ) associated with a drive piston ( 38 ) for applying, via a second elastic member ( 40 ), a force F 4 opposing the first force F 1 to the beam of the balance so as to cause the fuel feed unit to open further during the transition from a first engine acceleration law to a second engine acceleration law.

1. A Hydromechanical regulator for controlling the flow of fuel injected into a turbomachine by means of a fuel feed unit ( 10 ), comprising
 a force balance ( 20 ) having a beam consisting of two arms ( 24 ,  26 ), which beam can move about a pivot pin ( 22 ) under the action of at least a first force (F 1 ) applied by a drive rod ( 18 ) of the fuel feed unit via a first elastic member ( 28 ), and 
 a rod ( 36 ) associated with a control piston ( 38 ) for applying, via a second elastic member ( 40 ), a force (F 4 ) opposing the first force to the beam of the balance so as to cause the fuel feed unit to open further during the transition from a first engine operating regime to a second engine operating regime, 
 wherein the rod of the control piston is furthermore coupled to an on/off pneumatic valve ( 44 ) for switching between the first engine operating regime and the second engine operating regime and connected, on one side, to a reference pressure P 0  and, on the other side, via air orifices S 0  and S 1 , to a pressure P 3  on the output side of a high-pressure compressor of the turbomachine. 
 
   
   
     2. A Hydromechanical regulator according to  claim 1 , characterized in that the first force is applied to a fixed point on the first lever arm ( 24 ) at a distance L f  from the pivot pin and in that the opposing force is applied to another fixed point on the first lever arm ( 24 ) at a distance L c  from the pivot pin. 
   
   
     3. A Hydromechanical regulator according to  claim 1 , characterized in that the pressure P 0  corresponds to the pressure on the inlet side of the high-pressure compressor or to atmospheric pressure. 
   
   
     4. A Hydromechanical regulator according to  claim 1 , characterized in that one of the air orifices is adjustable in order to allow the second engine operating regime to be regulated. 
   
   
     5. A Fuel feed unit in conbination with the hydromechanical regulator of  claim 1  for controlling the flow of fuel into a turbomachine, characterized in that the fuel feed unit includes a single feed opening ( 60 ,  62 ) ensuring, for the flow of fuel injected into the turbomachine, a continuous variation upon passing from a first engine operating regime to a second engine operating regime. 
   
   
     6. A Turbomachine, which includes a hydromechanical regulator according to  claim 1 .